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I have searched the forums and I haven't found the exact same symptoms that I have been seeing on my 7.3. (2000 Excursion)
Long story, but I broke down 300 miles from home, got it into a shop there and they tried to diagnose but found no codes other than 2 of my glow plugs are bad.
It would drive a short distance then start bucking and sometimes shut down.
They replaced the fuel filter first, then the CPS. Then the IDM. No change in symptoms. (Switched back to original IDM).
They scanned it for hours and said injector 8 failed CCT, but that was after they swapped the CPS. I found documentation later that the new CPS can cause that to happen.
They did some other test to verify connection between the IDM and the PCM and it passed. Not sure what that was called.
I found that if I unhooked the ICP sensor it ran better, but would still stall briefly. It was easier to drive it into the lot and onto a trailer.
They did not check fuel pressure.
I eventually got it home and I checked the UVCH and all the injectors ohm at 2.8 ohms, all the glow plugs tested good except the 2 indicated by the engine codes.
I replaced the ICP and harness, since it was soaked in oil. Still stalling.
I downloaded the Torque Pro app and the PIDs to see the real time data.
The only thing that seems out of place is the Injector Pulse Width. It starts around 2.8 but it will start hunting and when the engine is starting to run rough the PW is bouncing around from 0 to .6 to 4.0. I did a PID chart on the spreadsheet tool provided on this site and it looks like the PW goes erratic before anything else.
I have checked the harness for a short at the valve cover several times since I have had that problem before.
I just finished checking the fuel pressure while running and stays steady at 65 psi when idling, and it does drop when the engine chokes to about 60, but no lower. It seemed to follow the stall, not precede it.
What would cause the PW to jump around? It seems to me like it would be the IDM, but I feel like that is ruled out by it being swapped earlier.
I am seeing a p1316 code on Torque, which says codes are stored in the IDM, but I don't have a way to read them yet.
Scott
I had chronic "crank no start" probs on my e99. It was due to low oil levels in the high pressure oil pump reservoir (ultimately fixed by changing low pressure pump). The only time I have had a stall on mine while driving, my oil level in the rez was down a bit (I was tuned in to checking the rez level to get it started so it was the first thing I checked when it stalled out). Added less than a qt (into rez) and all was good. Given that you have checked all the "usual characters", an oil pressure/level check might be in order.
Nice work looking at the live PIDs - I'd suggest using FORScan to read codes, view PIDs and see if Torque missed any. It will also run the "buzz" test (KOEO Injector Electrical Self Test in FORScan) and tell you what specific codes are behind that P1316 code.
My PCM is not chipped. Everything is stock on the truck.
I did use a Motorcraft ICP after first getting a counterfeit ICP on eBay. And I got an Alliant pigtail, which I soldered in.
I will look into getting Forscan, I didn't realize it would do IDM codes.
I also want to add that I had the engine removed from the truck about a month ago by a mechanic who replaced the oil pan. While he had it out he also replaced the valve cover gaskets and the fuel lines among other things.
I found a thread with a similar story and he ended up having a pinched wire on the new valve cover harness, even though his ohm test was good. Someone pointed out that his picture showed a pinched wire for the glow plug and they didn't think that would cause the problem but there was no further posting on that thread.
This really acts like an electrical problem to me. If it is a pinched wire on my valve cover harness it will be covered under warranty with the mechanic but I'm just wondering what the probability is on that.
The IDM that was swapped was not Motorcraft. It was the only one available in the area at the time. The symptoms did not change so I had them go back to my original IDM.
Ok, that helps. Issues with the passenger side bank - bank #1. Time to do some wire harness testing.
With the IDM disconnected, you can check for a short to ground on cylinder #1 low side, and bank #1 high side (fuel injector feed). See the attached troubleshooting diagram and pictures:
I would not worry about P1298 just yet. That might clear when the wiring issue is resolved.
"Is your PCM chipped? If so, remove it and see if that helps. When it stumbles, do any dash lights come on?"
Yes, I do get dash lights when it stumbles. One of them was "Water in Fuel" so my initial thought when stranded along the road was to drain the water separator several times.
After I drained it a few times and added Iso-Heet and 10 gallons of diesel, it seemed to run great for about another 45 minutes, then it got worse and I limped it into the repair shop.
Last edited by dchaney71; Jul 27, 2021 at 08:31 PM.
Reason: added quote
@Walleye Hunter is on to it, I bet. Check your 42 pin connector harness where it passes over the driver's side valve cover. It can rub through and short a wire or two intermittently, causing the stumble/stall and SES/WIF/WTS lights. There is your short to ground on those 2 wires.
Yep, I had that harness short there before on the valve cover years ago, but it wasn't that severe. I taped it up real good and haven't had any trouble since. But I will untape and make sure it hasn't deteriorated further.
